Nanoscale Advances
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2019
·Vol. 1
·期 9
·3607-3613
·
IF 0
Zhaohong Su,Yongbing Cheng,Chaorong Li,Yuanfu Xiong,Langtao Xiao,Shu Chen,Xiaoli Qin
An amperometric immunosensor based on new thiolated bionanocomposite with a high dispersion of gold nanoparticles (AuNPs) for the sensitive detection of indole-3-acetic acid (IAA) is being reported herein. Briefly, a thiolated nanocomposite was prepared via the microwave-assisted thiol–ene reaction of 2,5-dimercapto-1,3,4-thiadiazole (DMcT) with oxidized polyaniline (PANI), which was synthesized in the presence of multiwalled carbon nanotubes (MWCNTs), yielding thiolated polyaniline (TPANI)-MWCNTs. Further, AuNPs were deposited on the TPANI-MWCNTs by microwave-assisted method to obtain a AuNPs/TPANI-MWCNTs nanocomposite. Finally, the thiolated bionanocomposite film was constructed via the specific chemical reaction between boronic acid functionalized AuNPs and the vicinal diol functionalized AuNP labeled immunoglobulin G (IgG–AuNPs). The change in the reduction peak current of Fe(CN)63− was used to monitor the immunoreaction between IAA and antibody. The TPANI-MWCNT nanocomposites uniformly disperse AuNPs, IgG–AuNPs and anti-IAA-AuNPs, leading to the amplification of the signal of the immunosensor. Fourier transform infrared spectra (FTIR), cyclic voltammetry (CV), transmission electron microscopy (TEM), ultraviolet visible spectroscopy (UV-vis) and differential pulse voltammetry (DPV) were used to characterize the nanocomposite film and the stepwise modification of the immunosensor. The prepared thiolated bionanocomposite material has good biocompatibility, a highly uniform dispersion of the AuNPs with a narrow size distribution as verified by TEM, and high load/activity of the immobilized antibody proved via DPV. The fabricated IAA amperometric immunosensor not only exhibits a good linear arrange from 1.0 pg mL−1 to 10 ng mL−1 with the limit of detection of 0.97 pg mL−1 (S/N = 3), but also possesses good selectivity, reproducibility and stability for the detection of IAA.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Xiaorong Zhang,Muhammad Shakeel,Baoshan Li,Muhammad Arif,Xianglong Kong,Jianjun Liu,Shengli Zuo
The present study is about the fabrication of an efficient photo-/electrocatalyst, prepared via in-situ hydrothermal coupling of ZnO with g-C 3 N 4 . The results prove this electrocatalyst as suitable band structure semiconductor. The crystalline nature and related morphological parameters are controlled by optimized hydrothermal and calcination temperatures conditions. A series of physicochemical characterization are applied to inquire the crystalline structure, surface morphology , optical capabilities and charge transportation properties. Results revealed that the sample acts as excellent electrocatalyst with OER current density at 10 mAcm −2 @ 335 mV and the HER at 100 mAcm −2 @ −225 mV. While upon illuminations its catalytic properties further enhance at OER 10 mAcm −2 @ 326 mV and for HER current density of 100 mAcm −2 @ −167 mV. It can be seen from the present study that g-C 3 N 4 play gigantic role in enhancing the catalytic property of ZnO and hence it leads to a relationship between hierarchical features and photo-/electrochemical activity for water splitting.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2019
·
IF 4.784
Yancun Yu,Yi Li,Changyu Han,Liguang Xiao
The aim of this study is to use natural orotic acid (OA) as a sustainable, environmentally friendly additive to improve the crystallization, rheological, thermal, mechanical, and biodegradation properties of bacterially synthesized poly(3-hydroxybutyrate- co -4-hydroxybutyrate) (P34HB). OA was found to be an efficient nucleating agent for P34HB, and dramatically enhanced both non-isothermal and isothermal crystallization rates. The incorporation of OA increased nucleation density and decreased spherulite size, but had little effect on the crystalline structure. The rheological properties of the P34HB were greatly improved by the solid filler OA, particularly when a percolation network structure was formed in the blends. The thermal stability of P34HB was strongly enhanced, as exemplified by the ~23 °C increase in the onset thermal decomposition temperature ( T o ) for the blend loaded with 5 wt% OA compared to that of pure P34HB. Moreover, the yield strength and elongation at break of P34HB containing 0.5 wt% OA increased by 25% and 119%, respectively. The most intriguing result was the clear enhancement in the enzymatic hydrolysis rates of the P34HB/OA blends compared to that of neat P34HB. The synergetic improvement in these properties may be of significant importance for the wider practical application of biosourced P34HB.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2019
·
IF 2.298
Wenqi Zhao,Yitong Dai,Haiyun Sun,Yongsheng Guo,Wenjun Fang
Biofuel mixed with fossil jet fuels has a lot of potential in applications of jet fuel extenders. To understand the fundamental properties of this typical mixture, measurements on densities and viscosities for the ternary model system of exo-tetrahydrodicyclopentadiene (1) + isopropylcyclohexane (2) + methyl laurate (3) and three corresponding binary mixtures have been implemented over the entire composition range at eleven different temperatures from 293.15 to 343.15 K. The excess molar volumes (VmE) and viscosity deviations (Δη) of binary mixtures were calculated and correlated by the Redlich–Kister equation, while the corresponding data of ternary mixtures were fitted to Nagata–Tamura, Cibulka, Singh, and Redlich–Kister equations. Furthermore, the variations of VmE and Δη were represented and discussed based on molecular interactions and structural effects in detail.
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POWDER TECHNOLOGY
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2018
·
IF 3.23
Weiwei Chu,Zhenzhen Lu,Ruiqin Tan,Shihui Tang,Wei Xu,Weijie Song,Junhua Zhao
In this work, β-SrHPO 4 , Sr 3 (PO 4 ) 2 , and Sr 5 (PO 4 ) 3 (OH) (SrHAp) powders were successfully prepared by a controllable hydrothermal method and were utilized in removal of lead ion (Pb 2+ ). The effects of pH value, contact time and initial ion concentration on the immobilization of Pb 2+ were investigated systematically. Results showed that β-SrHPO 4 exhibited a capacity of 1438 ± 45 mg/g for Pb 2+ , while Sr 3 (PO 4 ) 2 and SrHAp showed values of 1223 ± 45 mg/g and 543 ± 45 mg/g respectively under the optimum conditions. The XRD , SEM and EDX results revealed that the mechanism of Pb 2+ immobilization by β-SrHPO 4 , Sr 3 (PO 4 ) 2 and SrHAp was mainly due to a process of dissolution and precipitation in the acidic solution. Comparing the immobilization behavior and capacities of β-SrHPO 4 , Sr 3 (PO 4 ) 2 and SrHAp for Pb 2+ removal, it is shown that β-SrHPO 4 is an effective and eco-friendly material for the removal of Pb 2+ from acidic aqueous solutions among strontium phosphates materials.
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Canadian Journal of Chemistry
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2018
·Vol. 96
·期 12
·
IF 1.084
Guanhong Liu,Peipei Ren,Fan Yang,Xuekai Dou,Jun Wang,Youtao Song
Two novel isomeric colorimetric probes are established for simultaneous determination of copper ions using 2-hydroxy-5-methoxybenzaldehyde fluorescein hydrazone (5-HMBA-FH) and 2-hydroxy-3-methoxybenzaldehyde fluorescein hydrazone (3-HMBA-FH). They are synthesized by reacting fluorescein hydrazide with 2-hydroxy-5-methoxybenzaldehyde and 2-hydroxy-3-methoxybenzaldehyde, respectively, and then characterized by 1H-NMR, 13C-NMR, and infrared spectrum. The addition of copper ions to the solutions of two novel colorimetric probes can generate the obviously peaks at 498 nm in UV–vis absorption spectra along with a rapid colour change from colourless to dark yellow. The detection limits of the method for Cu2+ ion were 3.442 × 10−6 mol/L and 3.682 × 10−6 mol/L separately for 5-HMBA-FH and 3-HMBA-FH, respectively. The additions of other metal ions hardly affect the determination of copper ions. The proposed method was successfully applied to the analysis of Cu2+ ions in various samples. This method possesses high sensitivity, high simplicity, and minimized interference and will provide a great advantage in detecting copper ions in the environment, food, and medical applications.
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FOOD RESEARCH INTERNATIONAL
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2018
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IF 3.52
Yumeng Zhang,Lin Chen,Yuanqi Lv,Shuangxi Wang,Zhiyao Suo,Xingguang Cheng,Xinglian Xu,Guanghong Zhou,Zhixi Li,Xianchao Feng
High levels of polyphenols can interact with myofibrillar proteins (MPs), causing damage to a MP emulsion gel. In this study, β -cyclodextrins were used to reduce covalent and non-covalent interaction between epigallocatechin-3-gallate (EGCG) and MPs under oxidative stress. The loss of both thiol and free amine groups and the unfolding of MPs caused by EGCG (80 μM/g protein) were significantly prevented by β -cyclodextrins, and the structural stability and solubility were improved. MP emulsion gel treated with EGCG (80 μM/g protein) had the highest cooking loss (68.64%) and gel strength (0.51 N). Addition of β -cyclodextrins significantly reduced cooking loss (26.24–58.20%) and improved gel strength (0.31–0.41 N) of MP emulsion gel jeopardized by EGCG under oxidative stress. Damage to the emulsifying properties of MPs caused by EGCG was significantly prevented by addition of β -cyclodextrins. β -cyclodextrins reduced interaction between EGCG and MPs in the order Methyl- β -cyclodextrin > (2-Hydroxypropyl)- β -cyclodextrin > β -cyclodextrin. In absence of EGCG, addition of β -cyclodextrins partly protected MPs from oxidative attack and improved its solubility. It is concluded that β -cyclodextrins does not markedly reduce the antioxidant ability of EGCG according to carbonyl analysis, and can effectively increase EGCG loading to potentially provide more durable antioxidant effect for meat products during processing, transportation and storage.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2018
·
IF 3.412
Xing Chen,David Julian McClements,Jian Wang,Liqiang Zou,Sumeng Deng,Wei Liu,Chi Yan,Yuqing Zhu,Ce Cheng,Chengmei Liu
Particle-stabilized W1/O/W2 emulsion gels were fabricated using a two-step procedure: (i) a W1/O emulsion was formed containing saccharose (for osmotic stress balance) and gelatin (as a gelling agent) in the aqueous phase and polyglycerol polyricinoleate (a lipophilic surfactant) in the oil phase; (ii) this W1/O emulsion was then homogenized with another water phase (W2) containing wheat gliadin nanoparticles (hydrophilic emulsifier). The gliadin nanoparticles in the external aqueous phase aggregated at pH 5.5, which led to the formation of particle-stabilized W1/O/W2 emulsion gels with good stability to phase separation. These emulsion gels were then used to coencapsulate a hydrophilic bioactive (epigallocatechin-3-gallate, EGCG) in the internal aqueous phase (encapsulation efficiency = 65.5%) and a hydrophobic bioactive (quercetin) in the oil phase (encapsulation efficiency = 97.2%). The emulsion gels improved EGCG chemical stability and quercetin solubility under simulated gastrointestinal conditions, which led to a 2- and 4-fold increase in their effective bioaccessibility, respectively.
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高影响因子
NEUROREPORT
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2018
·Vol. 29
·期 5
·432
·
IF 1.266
Zhang Jinghui,Qiao Nana,Ding Xiufang,Wang Jiwen
Excitotoxicity and neuronal death following epilepsy involve α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors (AMPARs). It forms a protein complex with glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and co-internalizes upon activation of AMPA receptors after epilepsy. Disruption of the GluA2 /GAPDH complex with an interfering peptide , TAT- GluA2 NT1-3-2 , protects cells against AMPAR-mediated excitotoxicity, which have been identified in in-vitro and in-vivo models of brain ischemia. We postulated that disruption of the GluA2 /GAPDH interaction with the TAT- GluA2 NT1-3-2 peptide would also protect against AMPAR-induced neuronal injury in an in-vivo model of status epilepticus (SE). In the present study, we divided pilocarpine -induced SE Wistar rats into three main groups: the TAT- GluA2 NT1-3-2 peptide group, the TAT- GluA2 NT-scram peptide group, and the normal saline group, and injected different doses of peptides stereotaxically into the hippocampus of SE rats to investigate whether the GluA2 /GAPDH interaction could be disrupted by our TAT- GluA2 NT1-3-2 peptide and determine its most appropriate dose. Then, the dose was administered stereotaxically at different time points after SE to determine the best administration time of neuronal protection. We found that the TAT- GluA2 NT1-3-2 peptide can disrupt the GluA2 /GAPDH interaction and protects against epilepsy-induced neuronal damage. The GluA2 /GAPDH interaction may be a novel therapeutic target for epilepsy.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2018
·Vol. 165
·期 9
·A1915
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IF 3.662
Yazhen Chen,Zhengliang Gong,Yong Yang
A fluorinated electrolyte consisting of fluorinated ether 1,1,2,2-Tetrafluoro-3-(1,1,2,2-tetrafluoroethoxy)propane (F-EPE) and 1,2-Dimethoxyethane (DME) is evaluated as a new electrolyte for Li-S batteries. The coulombic efficiency and capacity retention of Li–S batteries are significantly improved with the use of F-EPE/DME based electrolyte combing with PEO as binder. The Li-S batteries exhibit a high coulombic efficiency of ∼96% and capacity retention of 78% after 100 cycles at 0.1C. Moreover, the F-EPE based electrolyte can work well without LiNO3 additive, thus make it possible to eliminate the safety concerns raised by the gassing reaction of LiNO3. The function mechanism of F-EPE as cosolvent was investigated by self-discharge test, polysulfide dissolution experiments, SEM and UV-Vis spectra. The enhanced electrochemical performances can be attributed to that F-EPE cannot only decrease the solubility of lithium polysulfides in electrolyte thus suppress the shuttle effect, but also take part in the formation of passivation film on lithium metal anode, indicating the positive effect of F-EPE on electrochemical properties of Li-S batteries.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2019
·Vol. 138
·期 2
·1251-1257
·
IF 2.471
Wang Yanfei,Liu Xiaoyu,Zhao Xiaoyu,Chen Zhao,Yang Libin,Zhu Liang
Solid–liquid-phase equilibrium is an important part of chemical thermodynamics, and its basic theoretical research plays a vital role in the advancement of the chemical industry. Solid–liquid equilibria for binary mixtures of 3-nitrotoluene and 4-nitrotoluene were measured using differential scanning calorimetry under atmospheric pressure (101.3 kPa). The results showed that the phase diagram of the 3-nitrotoluene + 4-nitrotoluene binary system presented a eutectic behavior, and the eutectic point was x 1 = 0.6487, T E = 272.15 K. Furthermore, the experimental results were correlated with Wilson and nonrandom two-liquid (NRTL) activity coefficient models well. The relative standard deviations were 0.496 and 0.236, respectively, and the absolute mean deviations were 0.005 and 0.001, respectively.
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JOURNAL OF FOOD SCIENCE
·
2019
·Vol. 84
·期 8
·2042-2049
·
IF 2.081
Lipeng Han,Qingna Lin,Guoqin Liu,Dongxue Han,Li Niu,Dongxiao Su
It is important to inhibit the food-derived, potentially hazardous chemical glycated lipids by natural products. A model system was established and the products are identified to study the inhibitory mechanism of four types of catechin, resveratrol (RES), and the synthetic antioxidants butylated hydroxylanisole (BHA) and tert-butylhydroquinone (TBHQ) on the formation of carboxymethyl 1,2-dipalmitoyl-sn-glycero-3-phosphatidylethanolamine (CM-DPPE) by determining hydroxyl radical (OH·), Amadori-1,2-dipalmitoyl-sn-glycero-3-phosphatidylethanolamine (Amadori-DPPE) and glyoxal (GO). The results show that the inhibitory rates of catechin and RES on the content of CM-DPPE in the model system are higher than those of BHA and TBHQ. There are at least two inhibitory mechanisms of antioxidants on CM-DPPE. (1) Antioxidants scavenge OH·, which blocks the process of Amadori-DPPE oxidation to form CM-DPPE. (2) Antioxidants trap GO, which blocks the reaction between GO and DPPE to form CM-DPPE. This research will reveal the inhibitory mechanisms of natural antioxidants on glycated lipids from the aspect of scavenging OH· and trapping GO. Practical Application Food manufacturers should pay attention on the production of glycated lipids in food processing. This study will provide the theoretical basis for the use of natural products to inhibit the formation of food-derived glycated lipids. Natural products, such as catechin and resveratrol, can substitute chemical synthesis antioxidants, such as butylated hydroxylanisole and tert-butylhydroquinone, in food processing, which inhibit the formation of glycated lipids.
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